Serialbus and modbus are missing from qt-unified-linux-x64-3.0.6-online.run

After installing Qt 5.12.0 from qt-unified-linux-x64-3.0.6-online.run on Linux Centos 7.5 and trying to compile a simple program such as:

#include <QModbusTcpClient>

#include <QApplication> 

int main(int argc, char *argv[])

{ 

  return 0;

}

with .pro file like containing:

QT += core gui widgets serialbus serialport

I am getting the following error:

Project ERROR: Unknown module(s) in QT: serialbus

I initially wanted to use the Qt 5.6 that is included in Centos 7.5 repository, but the modbus and serial bus was missing from there too.